Trifluoromethyl Derivatives of Elusive Fullerene C98
Nadezhda B Tamm1, Runnan Guan2, Shangfeng Yang2
1Chemistry Department, Moscow State University, Leninskie gory, 119991, Moscow, Russia.
Abstract:
Data concerning the isomeric composition of C98 and the chemistry of C98 derivatives are scarce due to very low abundance of C98 in the fullerene soot. Trifluoromethylation of C98 -containing mixtures followed by HPLC separation of CF3 derivatives and single crystal X-ray diffraction study resulted in structural characterization of four compounds C98 (248)(CF3 )18/20 , C98 (116)(CF3 )18 , and C98 (120)(CF3 )20 . To date, these compounds represent the largest fullerenes isolated as CF3 derivatives with experimentally determined molecular structures. The addition patterns of C98 (CF3 )18/20 are discussed in detail revealing the stabilizing factors, such as isolated double C=C bonds and benzenoid rings on C98 fullerene cages. A detailed comparison with the addition patterns of the known C98 Cln allowed us to contribute to the better understanding the chemistry of elusive C98 fullerene.
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